I am guessing it means it's advertised at 2 for £6 but scanned at BOGOF. If the pods are £4 each (no idea, don't buy them) then you will pay £4 for 2 instead of £6 so essentially each pod is half price. How is that not a good deal?

I think the deal is...
They are probably about £4ish each box, and currently advertised as two for £6, However when scanned you get one at £4ish and the other free as BOGOF.
Therefore 2 for about £4ish.#